<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search @click="gotoSearch"></my-search>
   <view class="scroll-view-container">
     <!-- 左侧的滚动视图区域 -->
     <scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh +'px'}" >
      <block v-for="(item,i) in cateList" :key="i"><view :class="['left-scroll-view-item',i === active ? 'active' :'']" @click="activeChange(i)">{{item.cat_name}}</view></block> 
     </scroll-view>
     <!-- 右侧的滚动视图区域 -->
     <scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh +'px'}" :scroll-top="scrollTop">
       <view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
         <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
         
         <view class="cate-lv3-list">
           <!-- 三级分类 Item项 -->
           <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
             <!-- 三级分类图片 -->
            <!-- <image :src="item3.cat_icon"></image> -->
            <image src=""></image>
             <!--三级分类的文本-->
             <text>{{item3.cat_name}}</text>
           </view>
         </view>
       </view>
    </scroll-view>
   </view>
  </view>
</template>

<script>
  import badgeMix from '@/mixin/tabBar-badge.js'
  export default {
    mixins:[badgeMix],
    data() {
      return {
        wh:0,
        // 分类数据列表
        cateList: [],
        // 当前选中项的索引，默认让第一项被选中
        active: 0,
        //二级分类列表
        cateLevel2:[],
         // 滚动条距离顶部的距离
         scrollTop: 0
      };
    },
    onLoad(){
    const sysInfo = uni.getSystemInfoSync()
    // console.log(sysinfo)
    this.wh = sysInfo.windowHeight -50
    
    // 调用获取分类列表数据的方法
      this.getCateList()
    },
    methods:{
      // 发起请求
      async getCateList() {
        const {data:res} = await uni.$http.get('/api/public/v1/categories')
        // 判断是否获取失败
        if(res.meta.status !== 200) return uni.$showMsg()
        // 转存数据
        this.cateList = res.message,
        //为二级分类赋值
        this.cateLevel2 = res.message[0].children
          },
          activeChange(i) {
            this.active = i,
            this.cateLevel2 = this.cateList[i].children
            // 让 scrollTop 的值在 0 与 1 之间切换
            // this.scrollTop = this.scrollTop === 0 ? 1 : 0
              this.scrollTop = 1- this.scrollTop
          },
          gotoGoodsList(item3) {
            uni.navigateTo({
              url:'/subpkg/goods_list/goods_list?cid='+item3.cat_id
            })
        },
          gotoSearch(){
            uni.navigateTo({
              url:'/subpkg/search/search'
            })
        }
    }
  }
</script>

<style lang="scss">
  .scroll-view-container{
    display: flex;
    
    .left-scroll-view{
      width: 120px;
      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;
        
        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;
          
          // 渲染激活项左侧的红色指示边线
          &::before {
            content: '';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top:50%;
            transform: translateY(-50%);
          }
        }
      }
    }
    .cate-lv2-title{
      font-size: 12px;
      text-align: center;
      padding: 15px 0;
      font-weight: bold;
    }
  }
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    .cate-lv3-item{
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      image{
        width: 60px;
        height: 60px;
      }
      text{
        font-size: 12px;
      }
    }
  }
</style>
